1 8a35f56c 2022-07-16 thomas /*
  2 8a35f56c 2022-07-16 thomas  * Copyright (c) 2020-2022 Tracey Emery <tracey@traceyemery.net>
  3 8a35f56c 2022-07-16 thomas  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
  4 8a35f56c 2022-07-16 thomas  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
  5 8a35f56c 2022-07-16 thomas  *
  6 8a35f56c 2022-07-16 thomas  * Permission to use, copy, modify, and distribute this software for any
  7 8a35f56c 2022-07-16 thomas  * purpose with or without fee is hereby granted, provided that the above
  8 8a35f56c 2022-07-16 thomas  * copyright notice and this permission notice appear in all copies.
  9 8a35f56c 2022-07-16 thomas  *
 10 8a35f56c 2022-07-16 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11 8a35f56c 2022-07-16 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12 8a35f56c 2022-07-16 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13 8a35f56c 2022-07-16 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14 8a35f56c 2022-07-16 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15 8a35f56c 2022-07-16 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16 8a35f56c 2022-07-16 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17 8a35f56c 2022-07-16 thomas  */
 18 8a35f56c 2022-07-16 thomas 
 19 8a35f56c 2022-07-16 thomas #include <arpa/inet.h>
 20 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 21 8a35f56c 2022-07-16 thomas #include <sys/socket.h>
 22 8a35f56c 2022-07-16 thomas #include <sys/types.h>
 23 0335d24d 2022-08-06 thomas #include <sys/uio.h>
 24 8a35f56c 2022-07-16 thomas 
 25 8a35f56c 2022-07-16 thomas #include <errno.h>
 26 8a35f56c 2022-07-16 thomas #include <event.h>
 27 79393471 2022-08-27 thomas #include <imsg.h>
 28 79393471 2022-08-27 thomas #include <stdarg.h>
 29 8a35f56c 2022-07-16 thomas #include <stdlib.h>
 30 8a35f56c 2022-07-16 thomas #include <stdio.h>
 31 8a35f56c 2022-07-16 thomas #include <string.h>
 32 8a35f56c 2022-07-16 thomas #include <time.h>
 33 8a35f56c 2022-07-16 thomas #include <unistd.h>
 34 8a35f56c 2022-07-16 thomas 
 35 8a35f56c 2022-07-16 thomas #include "got_error.h"
 36 ff36aeea 2022-07-16 thomas 
 37 ff36aeea 2022-07-16 thomas #include "got_compat.h"
 38 8a35f56c 2022-07-16 thomas 
 39 8a35f56c 2022-07-16 thomas #include "proc.h"
 40 8a35f56c 2022-07-16 thomas #include "gotwebd.h"
 41 8a35f56c 2022-07-16 thomas 
 42 8a35f56c 2022-07-16 thomas size_t	 fcgi_parse_record(uint8_t *, size_t, struct request *);
 43 8a35f56c 2022-07-16 thomas void	 fcgi_parse_begin_request(uint8_t *, uint16_t, struct request *,
 44 8a35f56c 2022-07-16 thomas 	    uint16_t);
 45 8a35f56c 2022-07-16 thomas void	 fcgi_parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
 46 e5539f76 2022-08-10 thomas int	 fcgi_send_response(struct request *, int, const void *, size_t);
 47 8a35f56c 2022-07-16 thomas 
 48 8a35f56c 2022-07-16 thomas void	 dump_fcgi_record_header(const char *, struct fcgi_record_header *);
 49 8a35f56c 2022-07-16 thomas void	 dump_fcgi_begin_request_body(const char *,
 50 8a35f56c 2022-07-16 thomas 	    struct fcgi_begin_request_body *);
 51 8a35f56c 2022-07-16 thomas void	 dump_fcgi_end_request_body(const char *,
 52 8a35f56c 2022-07-16 thomas 	    struct fcgi_end_request_body *);
 53 8a35f56c 2022-07-16 thomas 
 54 8a35f56c 2022-07-16 thomas extern int	 cgi_inflight;
 55 8a35f56c 2022-07-16 thomas extern volatile int client_cnt;
 56 8a35f56c 2022-07-16 thomas 
 57 8a35f56c 2022-07-16 thomas void
 58 8a35f56c 2022-07-16 thomas fcgi_request(int fd, short events, void *arg)
 59 8a35f56c 2022-07-16 thomas {
 60 8a35f56c 2022-07-16 thomas 	struct request *c = arg;
 61 8a35f56c 2022-07-16 thomas 	ssize_t n;
 62 8a35f56c 2022-07-16 thomas 	size_t parsed = 0;
 63 8a35f56c 2022-07-16 thomas 
 64 8a35f56c 2022-07-16 thomas 	n = read(fd, c->buf + c->buf_pos + c->buf_len,
 65 8a35f56c 2022-07-16 thomas 	    FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
 66 8a35f56c 2022-07-16 thomas 
 67 8a35f56c 2022-07-16 thomas 	switch (n) {
 68 8a35f56c 2022-07-16 thomas 	case -1:
 69 8a35f56c 2022-07-16 thomas 		switch (errno) {
 70 8a35f56c 2022-07-16 thomas 		case EINTR:
 71 8a35f56c 2022-07-16 thomas 		case EAGAIN:
 72 8a35f56c 2022-07-16 thomas 			return;
 73 8a35f56c 2022-07-16 thomas 		default:
 74 8a35f56c 2022-07-16 thomas 			goto fail;
 75 8a35f56c 2022-07-16 thomas 		}
 76 8a35f56c 2022-07-16 thomas 		break;
 77 8a35f56c 2022-07-16 thomas 
 78 8a35f56c 2022-07-16 thomas 	case 0:
 79 8a35f56c 2022-07-16 thomas 		log_debug("closed connection");
 80 8a35f56c 2022-07-16 thomas 		goto fail;
 81 8a35f56c 2022-07-16 thomas 	default:
 82 8a35f56c 2022-07-16 thomas 		break;
 83 8a35f56c 2022-07-16 thomas 	}
 84 8a35f56c 2022-07-16 thomas 
 85 8a35f56c 2022-07-16 thomas 	c->buf_len += n;
 86 8a35f56c 2022-07-16 thomas 
 87 8a35f56c 2022-07-16 thomas 	/*
 88 8a35f56c 2022-07-16 thomas 	 * Parse the records as they are received. Per the FastCGI
 89 8a35f56c 2022-07-16 thomas 	 * specification, the server need only receive the FastCGI
 90 8a35f56c 2022-07-16 thomas 	 * parameter records in full; it is free to begin execution
 91 8a35f56c 2022-07-16 thomas 	 * at that point, which is what happens here.
 92 8a35f56c 2022-07-16 thomas 	 */
 93 8a35f56c 2022-07-16 thomas 	do {
 94 8a35f56c 2022-07-16 thomas 		parsed = fcgi_parse_record(c->buf + c->buf_pos, c->buf_len, c);
 95 8a35f56c 2022-07-16 thomas 		if (parsed != 0) {
 96 8a35f56c 2022-07-16 thomas 			c->buf_pos += parsed;
 97 8a35f56c 2022-07-16 thomas 			c->buf_len -= parsed;
 98 8a35f56c 2022-07-16 thomas 		}
 99 8a35f56c 2022-07-16 thomas 	} while (parsed > 0 && c->buf_len > 0);
100 8a35f56c 2022-07-16 thomas 
101 8a35f56c 2022-07-16 thomas 	/* Make space for further reads */
102 8a35f56c 2022-07-16 thomas 	if (parsed != 0)
103 8a35f56c 2022-07-16 thomas 		if (c->buf_len > 0) {
104 8a35f56c 2022-07-16 thomas 			bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
105 8a35f56c 2022-07-16 thomas 			c->buf_pos = 0;
106 8a35f56c 2022-07-16 thomas 		}
107 8a35f56c 2022-07-16 thomas 	return;
108 8a35f56c 2022-07-16 thomas fail:
109 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request(c);
110 8a35f56c 2022-07-16 thomas }
111 8a35f56c 2022-07-16 thomas 
112 8a35f56c 2022-07-16 thomas size_t
113 8a35f56c 2022-07-16 thomas fcgi_parse_record(uint8_t *buf, size_t n, struct request *c)
114 8a35f56c 2022-07-16 thomas {
115 8a35f56c 2022-07-16 thomas 	struct fcgi_record_header *h;
116 8a35f56c 2022-07-16 thomas 
117 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header))
118 8a35f56c 2022-07-16 thomas 		 return 0;
119 8a35f56c 2022-07-16 thomas 
120 8a35f56c 2022-07-16 thomas 	h = (struct fcgi_record_header*) buf;
121 8a35f56c 2022-07-16 thomas 
122 8a35f56c 2022-07-16 thomas 	dump_fcgi_record("", h);
123 8a35f56c 2022-07-16 thomas 
124 8a35f56c 2022-07-16 thomas 	if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
125 8a35f56c 2022-07-16 thomas 	    + h->padding_len)
126 8a35f56c 2022-07-16 thomas 		 return 0;
127 8a35f56c 2022-07-16 thomas 
128 8a35f56c 2022-07-16 thomas 	if (h->version != 1)
129 8a35f56c 2022-07-16 thomas 		log_warn("wrong version");
130 8a35f56c 2022-07-16 thomas 
131 8a35f56c 2022-07-16 thomas 	switch (h->type) {
132 8a35f56c 2022-07-16 thomas 	case FCGI_BEGIN_REQUEST:
133 8a35f56c 2022-07-16 thomas 		fcgi_parse_begin_request(buf +
134 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_record_header),
135 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
136 8a35f56c 2022-07-16 thomas 		break;
137 8a35f56c 2022-07-16 thomas 	case FCGI_PARAMS:
138 8a35f56c 2022-07-16 thomas 		fcgi_parse_params(buf + sizeof(struct fcgi_record_header),
139 8a35f56c 2022-07-16 thomas 		    ntohs(h->content_len), c, ntohs(h->id));
140 8a35f56c 2022-07-16 thomas 		break;
141 8a35f56c 2022-07-16 thomas 	case FCGI_STDIN:
142 8a35f56c 2022-07-16 thomas 	case FCGI_ABORT_REQUEST:
143 e5539f76 2022-08-10 thomas 		if (c->sock->client_status != CLIENT_DISCONNECT &&
144 e5539f76 2022-08-10 thomas 		    c->outbuf_len != 0) {
145 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT, c->outbuf,
146 e5539f76 2022-08-10 thomas 			    c->outbuf_len);
147 e5539f76 2022-08-10 thomas 		}
148 e5539f76 2022-08-10 thomas 
149 8a35f56c 2022-07-16 thomas 		fcgi_create_end_record(c);
150 8a35f56c 2022-07-16 thomas 		fcgi_cleanup_request(c);
151 8a35f56c 2022-07-16 thomas 		return 0;
152 8a35f56c 2022-07-16 thomas 	default:
153 8a35f56c 2022-07-16 thomas 		log_warn("unimplemented type %d", h->type);
154 8a35f56c 2022-07-16 thomas 		break;
155 8a35f56c 2022-07-16 thomas 	}
156 8a35f56c 2022-07-16 thomas 
157 8a35f56c 2022-07-16 thomas 	return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
158 8a35f56c 2022-07-16 thomas 	    + h->padding_len);
159 8a35f56c 2022-07-16 thomas }
160 8a35f56c 2022-07-16 thomas 
161 8a35f56c 2022-07-16 thomas void
162 8a35f56c 2022-07-16 thomas fcgi_parse_begin_request(uint8_t *buf, uint16_t n,
163 8a35f56c 2022-07-16 thomas     struct request *c, uint16_t id)
164 8a35f56c 2022-07-16 thomas {
165 8a35f56c 2022-07-16 thomas 	/* XXX -- FCGI_CANT_MPX_CONN */
166 8a35f56c 2022-07-16 thomas 	if (c->request_started) {
167 8a35f56c 2022-07-16 thomas 		log_warn("unexpected FCGI_BEGIN_REQUEST, ignoring");
168 8a35f56c 2022-07-16 thomas 		return;
169 8a35f56c 2022-07-16 thomas 	}
170 8a35f56c 2022-07-16 thomas 
171 8a35f56c 2022-07-16 thomas 	if (n != sizeof(struct fcgi_begin_request_body)) {
172 8a35f56c 2022-07-16 thomas 		log_warn("wrong size %d != %lu", n,
173 8a35f56c 2022-07-16 thomas 		    sizeof(struct fcgi_begin_request_body));
174 8a35f56c 2022-07-16 thomas 		return;
175 8a35f56c 2022-07-16 thomas 	}
176 8a35f56c 2022-07-16 thomas 
177 8a35f56c 2022-07-16 thomas 	c->request_started = 1;
178 8a35f56c 2022-07-16 thomas 	c->id = id;
179 8a35f56c 2022-07-16 thomas }
180 8a35f56c 2022-07-16 thomas 
181 8a35f56c 2022-07-16 thomas void
182 8a35f56c 2022-07-16 thomas fcgi_parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
183 8a35f56c 2022-07-16 thomas {
184 8a35f56c 2022-07-16 thomas 	uint32_t name_len, val_len;
185 4630b4b5 2022-09-01 thomas 	uint8_t *sd, *val;
186 8a35f56c 2022-07-16 thomas 
187 8a35f56c 2022-07-16 thomas 	if (!c->request_started) {
188 8a35f56c 2022-07-16 thomas 		log_warn("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
189 8a35f56c 2022-07-16 thomas 		return;
190 8a35f56c 2022-07-16 thomas 	}
191 8a35f56c 2022-07-16 thomas 
192 8a35f56c 2022-07-16 thomas 	if (c->id != id) {
193 8a35f56c 2022-07-16 thomas 		log_warn("unexpected id, ignoring");
194 8a35f56c 2022-07-16 thomas 		return;
195 8a35f56c 2022-07-16 thomas 	}
196 8a35f56c 2022-07-16 thomas 
197 8a35f56c 2022-07-16 thomas 	if (n == 0) {
198 8a35f56c 2022-07-16 thomas 		gotweb_process_request(c);
199 8a35f56c 2022-07-16 thomas 		return;
200 8a35f56c 2022-07-16 thomas 	}
201 8a35f56c 2022-07-16 thomas 
202 8a35f56c 2022-07-16 thomas 	while (n > 0) {
203 8a35f56c 2022-07-16 thomas 		if (buf[0] >> 7 == 0) {
204 8a35f56c 2022-07-16 thomas 			name_len = buf[0];
205 8a35f56c 2022-07-16 thomas 			n--;
206 8a35f56c 2022-07-16 thomas 			buf++;
207 8a35f56c 2022-07-16 thomas 		} else {
208 8a35f56c 2022-07-16 thomas 			if (n > 3) {
209 8a35f56c 2022-07-16 thomas 				name_len = ((buf[0] & 0x7f) << 24) +
210 8a35f56c 2022-07-16 thomas 				    (buf[1] << 16) + (buf[2] << 8) + buf[3];
211 8a35f56c 2022-07-16 thomas 				n -= 4;
212 8a35f56c 2022-07-16 thomas 				buf += 4;
213 8a35f56c 2022-07-16 thomas 			} else
214 8a35f56c 2022-07-16 thomas 				return;
215 8a35f56c 2022-07-16 thomas 		}
216 8a35f56c 2022-07-16 thomas 
217 4630b4b5 2022-09-01 thomas 		if (n == 0)
218 8a35f56c 2022-07-16 thomas 			return;
219 8a35f56c 2022-07-16 thomas 
220 4630b4b5 2022-09-01 thomas 		if (buf[0] >> 7 == 0) {
221 4630b4b5 2022-09-01 thomas 			val_len = buf[0];
222 4630b4b5 2022-09-01 thomas 			n--;
223 4630b4b5 2022-09-01 thomas 			buf++;
224 4630b4b5 2022-09-01 thomas 		} else {
225 4630b4b5 2022-09-01 thomas 			if (n > 3) {
226 4630b4b5 2022-09-01 thomas 				val_len = ((buf[0] & 0x7f) << 24) +
227 4630b4b5 2022-09-01 thomas 					(buf[1] << 16) + (buf[2] << 8) +
228 4630b4b5 2022-09-01 thomas 					buf[3];
229 4630b4b5 2022-09-01 thomas 				n -= 4;
230 4630b4b5 2022-09-01 thomas 				buf += 4;
231 4630b4b5 2022-09-01 thomas 			} else
232 4630b4b5 2022-09-01 thomas 				return;
233 8a35f56c 2022-07-16 thomas 		}
234 8a35f56c 2022-07-16 thomas 
235 4630b4b5 2022-09-01 thomas 		if (n < name_len + val_len)
236 8a35f56c 2022-07-16 thomas 			return;
237 8a35f56c 2022-07-16 thomas 
238 4630b4b5 2022-09-01 thomas 		val = buf + name_len;
239 8a35f56c 2022-07-16 thomas 
240 4630b4b5 2022-09-01 thomas 		if (c->querystring[0] == '\0' &&
241 4630b4b5 2022-09-01 thomas 		    val_len < MAX_QUERYSTRING &&
242 4630b4b5 2022-09-01 thomas 		    name_len == 12 &&
243 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "QUERY_STRING", 12) == 0) {
244 4630b4b5 2022-09-01 thomas 			memcpy(c->querystring, val, val_len);
245 8a35f56c 2022-07-16 thomas 			c->querystring[val_len] = '\0';
246 8a35f56c 2022-07-16 thomas 		}
247 8a35f56c 2022-07-16 thomas 
248 4630b4b5 2022-09-01 thomas 		if (c->http_host[0] == '\0' &&
249 4630b4b5 2022-09-01 thomas 		    val_len < GOTWEBD_MAXTEXT &&
250 4630b4b5 2022-09-01 thomas 		    name_len == 9 &&
251 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "HTTP_HOST", 9) == 0) {
252 4630b4b5 2022-09-01 thomas 			memcpy(c->http_host, val, val_len);
253 4630b4b5 2022-09-01 thomas 			c->http_host[val_len] = '\0';
254 4630b4b5 2022-09-01 thomas 
255 8a35f56c 2022-07-16 thomas 			/*
256 8a35f56c 2022-07-16 thomas 			 * lazily get subdomain
257 8a35f56c 2022-07-16 thomas 			 * will only get domain if no subdomain exists
258 8a35f56c 2022-07-16 thomas 			 * this can still work if gotweb server name is the same
259 8a35f56c 2022-07-16 thomas 			 */
260 4630b4b5 2022-09-01 thomas 			sd = strchr(c->http_host, '.');
261 8a35f56c 2022-07-16 thomas 			if (sd)
262 8a35f56c 2022-07-16 thomas 				*sd = '\0';
263 8a35f56c 2022-07-16 thomas 		}
264 4630b4b5 2022-09-01 thomas 
265 4630b4b5 2022-09-01 thomas 		if (c->script_name[0] == '\0' &&
266 4630b4b5 2022-09-01 thomas 		    val_len < MAX_SCRIPT_NAME &&
267 4630b4b5 2022-09-01 thomas 		    name_len == 11 &&
268 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "SCRIPT_NAME", 11) == 0) {
269 4630b4b5 2022-09-01 thomas 			memcpy(c->script_name, val, val_len);
270 3f0158b4 2022-08-30 thomas 			c->script_name[val_len] = '\0';
271 8a35f56c 2022-07-16 thomas 		}
272 4630b4b5 2022-09-01 thomas 
273 4630b4b5 2022-09-01 thomas 		if (c->server_name[0] == '\0' &&
274 4630b4b5 2022-09-01 thomas 		    val_len < MAX_SERVER_NAME &&
275 4630b4b5 2022-09-01 thomas 		    name_len == 11 &&
276 4630b4b5 2022-09-01 thomas 		    strncmp(buf, "SERVER_NAME", 11) == 0) {
277 4630b4b5 2022-09-01 thomas 			memcpy(c->server_name, val, val_len);
278 8a35f56c 2022-07-16 thomas 			c->server_name[val_len] = '\0';
279 8a35f56c 2022-07-16 thomas 		}
280 8a35f56c 2022-07-16 thomas 
281 4630b4b5 2022-09-01 thomas 		buf += name_len + val_len;
282 4630b4b5 2022-09-01 thomas 		n -= name_len - val_len;
283 8a35f56c 2022-07-16 thomas 	}
284 8a35f56c 2022-07-16 thomas }
285 8a35f56c 2022-07-16 thomas 
286 8a35f56c 2022-07-16 thomas void
287 8a35f56c 2022-07-16 thomas fcgi_timeout(int fd, short events, void *arg)
288 8a35f56c 2022-07-16 thomas {
289 8a35f56c 2022-07-16 thomas 	fcgi_cleanup_request((struct request*) arg);
290 8a35f56c 2022-07-16 thomas }
291 8a35f56c 2022-07-16 thomas 
292 8a35f56c 2022-07-16 thomas int
293 55144267 2022-09-07 thomas fcgi_vprintf(struct request *c, const char *fmt, va_list ap)
294 79393471 2022-08-27 thomas {
295 79393471 2022-08-27 thomas 	char *str;
296 79393471 2022-08-27 thomas 	int r;
297 79393471 2022-08-27 thomas 
298 79393471 2022-08-27 thomas 	r = vasprintf(&str, fmt, ap);
299 79393471 2022-08-27 thomas 	if (r == -1) {
300 79393471 2022-08-27 thomas 		log_warn("%s: asprintf", __func__);
301 79393471 2022-08-27 thomas 		return -1;
302 79393471 2022-08-27 thomas 	}
303 79393471 2022-08-27 thomas 
304 79393471 2022-08-27 thomas 	r = fcgi_gen_binary_response(c, str, r);
305 79393471 2022-08-27 thomas 	free(str);
306 79393471 2022-08-27 thomas 	return r;
307 79393471 2022-08-27 thomas }
308 79393471 2022-08-27 thomas 
309 79393471 2022-08-27 thomas int
310 55144267 2022-09-07 thomas fcgi_printf(struct request *c, const char *fmt, ...)
311 55144267 2022-09-07 thomas {
312 55144267 2022-09-07 thomas 	va_list ap;
313 55144267 2022-09-07 thomas 	int r;
314 55144267 2022-09-07 thomas 
315 55144267 2022-09-07 thomas 	va_start(ap, fmt);
316 55144267 2022-09-07 thomas 	r = fcgi_vprintf(c, fmt, ap);
317 55144267 2022-09-07 thomas 	va_end(ap);
318 55144267 2022-09-07 thomas 
319 55144267 2022-09-07 thomas 	return r;
320 55144267 2022-09-07 thomas }
321 55144267 2022-09-07 thomas 
322 55144267 2022-09-07 thomas int
323 8a35f56c 2022-07-16 thomas fcgi_gen_binary_response(struct request *c, const uint8_t *data, int len)
324 8a35f56c 2022-07-16 thomas {
325 e5539f76 2022-08-10 thomas 	int r;
326 e5539f76 2022-08-10 thomas 
327 8a35f56c 2022-07-16 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
328 8a35f56c 2022-07-16 thomas 		return -1;
329 8a35f56c 2022-07-16 thomas 
330 0c2c6365 2022-07-28 thomas 	if (data == NULL || len == 0)
331 8a35f56c 2022-07-16 thomas 		return 0;
332 8a35f56c 2022-07-16 thomas 
333 e5539f76 2022-08-10 thomas 	/*
334 e5539f76 2022-08-10 thomas 	 * special case: send big replies -like blobs- directly
335 e5539f76 2022-08-10 thomas 	 * without copying.
336 e5539f76 2022-08-10 thomas 	 */
337 e5539f76 2022-08-10 thomas 	if (len > sizeof(c->outbuf)) {
338 e5539f76 2022-08-10 thomas 		if (c->outbuf_len > 0) {
339 e5539f76 2022-08-10 thomas 			fcgi_send_response(c, FCGI_STDOUT,
340 e5539f76 2022-08-10 thomas 			    c->outbuf, c->outbuf_len);
341 e5539f76 2022-08-10 thomas 			c->outbuf_len = 0;
342 e5539f76 2022-08-10 thomas 		}
343 e5539f76 2022-08-10 thomas 		return fcgi_send_response(c, FCGI_STDOUT, data, len);
344 e5539f76 2022-08-10 thomas 	}
345 e5539f76 2022-08-10 thomas 
346 e5539f76 2022-08-10 thomas 	if (len < sizeof(c->outbuf) - c->outbuf_len) {
347 e5539f76 2022-08-10 thomas 		memcpy(c->outbuf + c->outbuf_len, data, len);
348 e5539f76 2022-08-10 thomas 		c->outbuf_len += len;
349 e5539f76 2022-08-10 thomas 		return 0;
350 e5539f76 2022-08-10 thomas 	}
351 e5539f76 2022-08-10 thomas 
352 e5539f76 2022-08-10 thomas 	r = fcgi_send_response(c, FCGI_STDOUT, c->outbuf, c->outbuf_len);
353 e5539f76 2022-08-10 thomas 	if (r == -1)
354 e5539f76 2022-08-10 thomas 		return -1;
355 e5539f76 2022-08-10 thomas 
356 e5539f76 2022-08-10 thomas 	memcpy(c->outbuf, data, len);
357 e5539f76 2022-08-10 thomas 	c->outbuf_len = len;
358 8a35f56c 2022-07-16 thomas 	return 0;
359 8a35f56c 2022-07-16 thomas }
360 8a35f56c 2022-07-16 thomas 
361 e5539f76 2022-08-10 thomas static int
362 0335d24d 2022-08-06 thomas send_response(struct request *c, int type, const uint8_t *data,
363 0335d24d 2022-08-06 thomas     size_t len)
364 8a35f56c 2022-07-16 thomas {
365 0335d24d 2022-08-06 thomas 	static const uint8_t padding[FCGI_PADDING_SIZE];
366 0335d24d 2022-08-06 thomas 	struct fcgi_record_header header;
367 0335d24d 2022-08-06 thomas 	struct iovec iov[3];
368 8a35f56c 2022-07-16 thomas 	struct timespec ts;
369 a5a99557 2022-07-29 thomas 	ssize_t nw;
370 0335d24d 2022-08-06 thomas 	size_t padded_len, tot;
371 0335d24d 2022-08-06 thomas 	int i, err = 0, th = 2000;
372 8a35f56c 2022-07-16 thomas 
373 8a35f56c 2022-07-16 thomas 	ts.tv_sec = 0;
374 8a35f56c 2022-07-16 thomas 	ts.tv_nsec = 50;
375 8a35f56c 2022-07-16 thomas 
376 0335d24d 2022-08-06 thomas 	memset(&header, 0, sizeof(header));
377 0335d24d 2022-08-06 thomas 	header.version = 1;
378 0335d24d 2022-08-06 thomas 	header.type = type;
379 0335d24d 2022-08-06 thomas 	header.id = htons(c->id);
380 0335d24d 2022-08-06 thomas 	header.content_len = htons(len);
381 8a35f56c 2022-07-16 thomas 
382 8a35f56c 2022-07-16 thomas 	/* The FastCGI spec suggests to align the output buffer */
383 0335d24d 2022-08-06 thomas 	tot = sizeof(header) + len;
384 0335d24d 2022-08-06 thomas 	padded_len = FCGI_ALIGN(tot);
385 0335d24d 2022-08-06 thomas 	if (padded_len > tot) {
386 0335d24d 2022-08-06 thomas 		header.padding_len = padded_len - tot;
387 0335d24d 2022-08-06 thomas 		tot += header.padding_len;
388 8a35f56c 2022-07-16 thomas 	}
389 8a35f56c 2022-07-16 thomas 
390 0335d24d 2022-08-06 thomas 	iov[0].iov_base = &header;
391 0335d24d 2022-08-06 thomas 	iov[0].iov_len = sizeof(header);
392 8a35f56c 2022-07-16 thomas 
393 0335d24d 2022-08-06 thomas 	iov[1].iov_base = (void *)data;
394 0335d24d 2022-08-06 thomas 	iov[1].iov_len = len;
395 0335d24d 2022-08-06 thomas 
396 0335d24d 2022-08-06 thomas 	iov[2].iov_base = (void *)padding;
397 0335d24d 2022-08-06 thomas 	iov[2].iov_len = header.padding_len;
398 0335d24d 2022-08-06 thomas 
399 0335d24d 2022-08-06 thomas 	dump_fcgi_record("resp ", &header);
400 0335d24d 2022-08-06 thomas 
401 8a35f56c 2022-07-16 thomas 	/*
402 8a35f56c 2022-07-16 thomas 	 * XXX: add some simple write heuristics here
403 8a35f56c 2022-07-16 thomas 	 * On slower VMs, spotty connections, etc., we don't want to go right to
404 8a35f56c 2022-07-16 thomas 	 * disconnect. Let's at least try to write the data a few times before
405 8a35f56c 2022-07-16 thomas 	 * giving up.
406 8a35f56c 2022-07-16 thomas 	 */
407 0335d24d 2022-08-06 thomas 	while (tot > 0) {
408 0335d24d 2022-08-06 thomas 		nw = writev(c->fd, iov, nitems(iov));
409 a5a99557 2022-07-29 thomas 		if (nw == 0) {
410 a5a99557 2022-07-29 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
411 a5a99557 2022-07-29 thomas 			break;
412 a5a99557 2022-07-29 thomas 		}
413 a5a99557 2022-07-29 thomas 		if (nw == -1) {
414 a5a99557 2022-07-29 thomas 			err++;
415 a5a99557 2022-07-29 thomas 			if (errno == EAGAIN && err < th) {
416 a5a99557 2022-07-29 thomas 				nanosleep(&ts, NULL);
417 a5a99557 2022-07-29 thomas 				continue;
418 a5a99557 2022-07-29 thomas 			}
419 460244b7 2022-07-29 thomas 			log_warn("%s: write failure", __func__);
420 8a35f56c 2022-07-16 thomas 			c->sock->client_status = CLIENT_DISCONNECT;
421 e5539f76 2022-08-10 thomas 			return -1;
422 8a35f56c 2022-07-16 thomas 		}
423 a5a99557 2022-07-29 thomas 
424 0335d24d 2022-08-06 thomas 		if (nw != tot)
425 0335d24d 2022-08-06 thomas 			log_debug("%s: partial write: %zu vs %zu", __func__,
426 0335d24d 2022-08-06 thomas 			    nw, tot);
427 0335d24d 2022-08-06 thomas 
428 0335d24d 2022-08-06 thomas 		tot -= nw;
429 0335d24d 2022-08-06 thomas 		for (i = 0; i < nitems(iov); ++i) {
430 0335d24d 2022-08-06 thomas 			if (nw < iov[i].iov_len) {
431 0335d24d 2022-08-06 thomas 				iov[i].iov_base += nw;
432 0335d24d 2022-08-06 thomas 				iov[i].iov_len -= nw;
433 0335d24d 2022-08-06 thomas 				break;
434 0335d24d 2022-08-06 thomas 			}
435 0335d24d 2022-08-06 thomas 			nw -= iov[i].iov_len;
436 0335d24d 2022-08-06 thomas 			iov[i].iov_len = 0;
437 0335d24d 2022-08-06 thomas 		}
438 8a35f56c 2022-07-16 thomas 	}
439 e5539f76 2022-08-10 thomas 
440 e5539f76 2022-08-10 thomas 	return 0;
441 0335d24d 2022-08-06 thomas }
442 8a35f56c 2022-07-16 thomas 
443 e5539f76 2022-08-10 thomas int
444 0335d24d 2022-08-06 thomas fcgi_send_response(struct request *c, int type, const void *data,
445 0335d24d 2022-08-06 thomas     size_t len)
446 0335d24d 2022-08-06 thomas {
447 e5539f76 2022-08-10 thomas 	if (c->sock->client_status == CLIENT_DISCONNECT)
448 e5539f76 2022-08-10 thomas 		return -1;
449 e5539f76 2022-08-10 thomas 
450 0335d24d 2022-08-06 thomas 	while (len > FCGI_CONTENT_SIZE) {
451 e5539f76 2022-08-10 thomas 		if (send_response(c, type, data, len) == -1)
452 e5539f76 2022-08-10 thomas 			return -1;
453 0335d24d 2022-08-06 thomas 
454 0335d24d 2022-08-06 thomas 		data += FCGI_CONTENT_SIZE;
455 0335d24d 2022-08-06 thomas 		len -= FCGI_CONTENT_SIZE;
456 0335d24d 2022-08-06 thomas 	}
457 0335d24d 2022-08-06 thomas 
458 0335d24d 2022-08-06 thomas 	if (len == 0)
459 e5539f76 2022-08-10 thomas 		return 0;
460 0335d24d 2022-08-06 thomas 
461 e5539f76 2022-08-10 thomas 	return send_response(c, type, data, len);
462 8a35f56c 2022-07-16 thomas }
463 8a35f56c 2022-07-16 thomas 
464 8a35f56c 2022-07-16 thomas void
465 8a35f56c 2022-07-16 thomas fcgi_create_end_record(struct request *c)
466 8a35f56c 2022-07-16 thomas {
467 0335d24d 2022-08-06 thomas 	struct fcgi_end_request_body end_request;
468 8a35f56c 2022-07-16 thomas 
469 0335d24d 2022-08-06 thomas 	memset(&end_request, 0, sizeof(end_request));
470 0335d24d 2022-08-06 thomas 	end_request.app_status = htonl(0); /* script status */
471 0335d24d 2022-08-06 thomas 	end_request.protocol_status = FCGI_REQUEST_COMPLETE;
472 0335d24d 2022-08-06 thomas 
473 0335d24d 2022-08-06 thomas 	fcgi_send_response(c, FCGI_END_REQUEST, &end_request,
474 0335d24d 2022-08-06 thomas 	    sizeof(end_request));
475 8a35f56c 2022-07-16 thomas }
476 8a35f56c 2022-07-16 thomas 
477 8a35f56c 2022-07-16 thomas void
478 8a35f56c 2022-07-16 thomas fcgi_cleanup_request(struct request *c)
479 8a35f56c 2022-07-16 thomas {
480 8a35f56c 2022-07-16 thomas 	cgi_inflight--;
481 8a35f56c 2022-07-16 thomas 	client_cnt--;
482 8a35f56c 2022-07-16 thomas 
483 8a35f56c 2022-07-16 thomas 	evtimer_del(&c->tmo);
484 8a35f56c 2022-07-16 thomas 	if (event_initialized(&c->ev))
485 8a35f56c 2022-07-16 thomas 		event_del(&c->ev);
486 8a35f56c 2022-07-16 thomas 
487 8a35f56c 2022-07-16 thomas 	close(c->fd);
488 8a35f56c 2022-07-16 thomas 	gotweb_free_transport(c->t);
489 8a35f56c 2022-07-16 thomas 	free(c);
490 8a35f56c 2022-07-16 thomas }
491 8a35f56c 2022-07-16 thomas 
492 8a35f56c 2022-07-16 thomas void
493 8a35f56c 2022-07-16 thomas dump_fcgi_record(const char *p, struct fcgi_record_header *h)
494 8a35f56c 2022-07-16 thomas {
495 8a35f56c 2022-07-16 thomas 	dump_fcgi_record_header(p, h);
496 8a35f56c 2022-07-16 thomas 
497 8a35f56c 2022-07-16 thomas 	if (h->type == FCGI_BEGIN_REQUEST)
498 8a35f56c 2022-07-16 thomas 		dump_fcgi_begin_request_body(p,
499 8a35f56c 2022-07-16 thomas 		    (struct fcgi_begin_request_body *)(h + 1));
500 8a35f56c 2022-07-16 thomas 	else if (h->type == FCGI_END_REQUEST)
501 8a35f56c 2022-07-16 thomas 		dump_fcgi_end_request_body(p,
502 8a35f56c 2022-07-16 thomas 		    (struct fcgi_end_request_body *)(h + 1));
503 8a35f56c 2022-07-16 thomas }
504 8a35f56c 2022-07-16 thomas 
505 8a35f56c 2022-07-16 thomas void
506 8a35f56c 2022-07-16 thomas dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
507 8a35f56c 2022-07-16 thomas {
508 8a35f56c 2022-07-16 thomas 	log_debug("%sversion:         %d", p, h->version);
509 8a35f56c 2022-07-16 thomas 	log_debug("%stype:            %d", p, h->type);
510 8a35f56c 2022-07-16 thomas 	log_debug("%srequestId:       %d", p, ntohs(h->id));
511 8a35f56c 2022-07-16 thomas 	log_debug("%scontentLength:   %d", p, ntohs(h->content_len));
512 8a35f56c 2022-07-16 thomas 	log_debug("%spaddingLength:   %d", p, h->padding_len);
513 8a35f56c 2022-07-16 thomas 	log_debug("%sreserved:        %d", p, h->reserved);
514 8a35f56c 2022-07-16 thomas }
515 8a35f56c 2022-07-16 thomas 
516 8a35f56c 2022-07-16 thomas void
517 8a35f56c 2022-07-16 thomas dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
518 8a35f56c 2022-07-16 thomas {
519 8a35f56c 2022-07-16 thomas 	log_debug("%srole             %d", p, ntohs(b->role));
520 8a35f56c 2022-07-16 thomas 	log_debug("%sflags            %d", p, b->flags);
521 8a35f56c 2022-07-16 thomas }
522 8a35f56c 2022-07-16 thomas 
523 8a35f56c 2022-07-16 thomas void
524 8a35f56c 2022-07-16 thomas dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
525 8a35f56c 2022-07-16 thomas {
526 8a35f56c 2022-07-16 thomas 	log_debug("%sappStatus:       %d", p, ntohl(b->app_status));
527 8a35f56c 2022-07-16 thomas 	log_debug("%sprotocolStatus:  %d", p, b->protocol_status);
528 8a35f56c 2022-07-16 thomas }